A displaying method of a touch input device including a touch screen, a touch screen controller which detects a magnitude of a pressure of a touch input to a surface of the touch screen, and a controller which controls the touch screen on the basis of information detected by the touch screen controller, the displaying method including: detecting, by the touch screen controller, a magnitude of the pressure of the touch which is input to a first region when an object touches the first region of the surface of the touch screen in a state where a display of the touch screen is turned off, and displaying by controlling, by the controller, the touch screen such that, when the detected magnitude of the pressure is greater than that of a first reference pressure, a second region of the display of the touch screen is displayed.